Question

因式分解：169（a+b)*2-121(a-b)*2

Answer 1

169（a+b)*2-121(a-b)*2
=(13a+13b+11a-11b)(13a+13b-11a+11b)
=(24a+2b)(2a+24b)
=4(12a+b)(a+12b)

Answer 2

169（a+b)*2-121(a-b)*2=（13a+13b)*2-(11a-11b)*2=（13a+13b+11a-11b)(13a+13b-11a+11b)
=(24a+2b)(2a+24b)

Answer 3

169（a+b)*2-121(a-b)*2=[13(a+b)-11(a-b)][13(a+b)+11(a-b)]=(2a+24b)(24a+2b)=4(a+12b)(12a+b)

Answer 4

=338a+338b-242a+242b
=96a+580b
=12（8a+15b）
给分吧。